An ISIS supporter who encouraged lone-wolf attackers to target Prince George at school and inject poison into ice-cream has sensationally changed his plea to guilty .

Husnain Rashid, 32, originally denied telling followers to attack Thomas's Battersea where the young royal is taught, but he brought his trial at Woolwich Crown Court after admitting the offenses.

The jury heard he had posted a chilling message online showing an outline of George, the school's address and silhouette of a jihad fighter with the message: "Even the royal family will not be left alone".

Husnain Rashid encouraged attacks on Prince George with the chilling message 'Even the royal family will not be left alone' (Image: PA)

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"He provided an unstoppable and hate-filled flow of encouragement for others to commit acts of terror... attacks with vehicles, explosive devices, bombs, chemicals, any attack you can imagine one person committing on their own."

Other targets included the Halloween Parade in New York and railway stations in Australia, Ms Darlow said.

Nearly two weeks into his trial, the defendant, of Leonard Street, was re-indicted and pleaded guilty to three counts of engaging in conduct in preparation of terrorist acts and one count of encouraging terrorism.

Two charges of dissemination of a terrorist publication and one of failing to comply with a notice under the Regulation of Investigatory Powers Act will lay on file.